MacOSX 10.7 Lion doesn't support old version of netatalk (2.0.x?). Lion won't mount older version of netatalk volume and an error occurred.

It needs to be updated to the latest version.
After the update, if CNID DB error occurred, ' cnid_metad_enable="YES" ' must be set in /etc/rc.conf, then restarting netatalk fixes this problem.